I see those girls at the gym too... but most of the time they're using so little weight or not doing enough reps that I consider it somewhat lazy. There's one man woman at my gym who is one of those female bodybuilders. It is incredibly disturbing. Most girls go to the treadmill and put it on 3.5-4mph and don't run very far. That doesn't do very much IMO. Better than nothing, I guess.